The word “fartlek” – Swedish for “speed play” – conjures images of carefree runners effortlessly surging and slowing. Yet, for many, it remains an abstract concept, more discussed than actually *done*. The beauty of a fartlek lies in its freedom, but that very freedom can make it surprisingly difficult to execute.
UNLOCK EXPLOSIVE SPEED: The Fartlek Workout Elite Runners Swear By!
